Expandable trailer house, manufacturing method and construction method for an expandable trailer house

Abstract

To prevent the accumulation of sand and dust on the rails, reduce wear between the rollers and rails, prevent rail rust, achieve a simple structure, reduce costs, lessen the weight burden on workers, and ensure sufficient opening height. [Solution] The expandable trailer house 1 has a ceiling 21, side walls 22-25, and a floor 26, and comprises a box-shaped main body 2 having a rectangular opening 29 in the side wall 22 in the longitudinal direction L, a frame 3 that can change between a stored state and an expanded state and is attached to the opening 29, and rail members 4. The frame 3 is divided into a roof panel 31 that is rotatably attached to the upper edge in the longitudinal direction of the opening 29, a floor panel 32 that is rotatably attached to the lower edge in the longitudinal direction L of the opening 29, a left side panel 33 that is rotatably attached to the left edge in the height direction H of the opening 29, a right side panel 34 that is rotatably attached to the right edge in the height direction H of the opening 29, and a front panel 35 that has a roller 35b on its upper edge 35a that can move along the rail members 4.

Description

Technical Field

[0001] The present invention relates to an extended trailer house that can be towed by a vehicle, a method for manufacturing the extended trailer house, and a construction method.

Background Art

[0002] The invention of Patent Document 1 provides a trailer house that can smoothly perform the operation of taking in and out the internal space expansion part and can simplify the structure of the internal space expansion part. A small room part support device for supporting the small room part is composed of a pair of front and rear support roller devices 41, 41. Each support roller device 41 is composed of a guide pipe 43 fixed to the lower side of the floor part of the house body, a support guide pipe 45 slidably inserted into this guide pipe 43, and a support rod 47 slidably inserted into this support guide pipe 45. An up-and-down movement roller device 49 is attached to the tip of the support guide pipe 45, and an up-and-down movement roller device 49 is also attached to the tip of the support rod 47.

[0003] The invention of Patent Document 2 is a house, a method for expanding the interior of the house, and a trailer house that can expand the interior of the house. It provides a house configured not to cause a step in the height between the main body floor panel arranged on the floor inside the house body when expanded and the internal expansion panel arranged in the internal expansion house after expansion. The internal expansion frame body includes a bottom frame body part disposed in the blank part between the side floor parts when pushed in, and is attached at an interval upward from the bottom frame body part, and includes rollers that run on a guide rail that enables pulling out and pushing in through the opening of the internal expansion frame body from the house body.

[0004] Patent Document 3 proposes a trailer house that, firstly, is easy to move and transport, secondly, is easy to install, thirdly, does not take up space for storage, movement, and transport, and can be installed and used in a larger space, and fourthly, can be used for various purposes such as residences, shops, offices, workshops, dormitories, rest areas, and others. This trailer house is towed and moved, and comprises a chassis frame 1, wheels disposed below the chassis frame 1, and a house section 3 mounted on the chassis frame 1. The house section 3 comprises a main unit 4 connected and fixed on the chassis frame 1, and a sub-unit 5 assembled inside the main unit 4. A rail section 22 is provided below the main unit 4, an extension frame 23 and extension rails 24 are provided on the outside of the chassis frame 1, rollers 25 are provided below the sub-unit 5, and connecting parts and lifting legs are provided on the chassis frame 1, etc.

[0005] The invention described in Patent Document 4 is a camper van in which a basic body with one side open is installed on the cargo bed of a drivable vehicle body, a movable chamber having a space that communicates with the interior of the basic body is arranged to be retractable and retractable relative to the basic body, and a movable part of an extendable drive mechanism with a fixed part attached to the vehicle body is connected to the movable chamber, and the movable chamber can be extended from the basic body using rails and rollers by operating the extendable drive mechanism as needed.

[0006] The invention described in Patent Document 5 is a mobile, simple dwelling characterized by a box-shaped structure that forms a main room inside, which is designed to be loaded onto the cargo bed of a vehicle such as a truck or trailer, and an auxiliary box-shaped structure that forms an overhanging room communicating with the main room on the side of the box-shaped structure, which is slidably mounted on a guide rail by an operating cylinder, and when the auxiliary box-shaped structure is extended outward from the box-shaped structure the interior space is expanded, and when the auxiliary box-shaped structure is stored inside the box-shaped structure the interior space is reduced so that it can be transported.

[0007] The invention described in Patent Document 6 provides a trailer house that can be expanded to approximately 2 to 3 times its towing capacity by unfolding the floor, walls, and roof. The mechanism involves opening the movable walls, moving them along rails built into the floor panels, and forming walls on all four sides as continuous walls with the side wall panels.

[0008] The invention described in Patent Document 7 proposes an expandable trailer house in which the individual components of a box-frame structure are unfolded without using rails. The structure, which unfolds the individual components by folding the side wall members like a screen or by rotating the floor and roof members, is described in Figures 2 to 4 and the corresponding sections. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Patent No. 5002781 [Patent Document 2] Patent No. 7085782 [Patent Document 3] Japanese Patent Application Publication No. 11-107553 [Patent Document 4] Japanese Patent Application Publication No. 55-019657 [Patent Document 5] Japanese Unexamined Patent Publication No. 62-233381 [Patent Document 6] Utility Model Registration No. 3107648 Gazette [Patent Document 7] Patent No. 7199107 [Overview of the project] [Problems that the invention aims to solve]

[0010] However, while the above-mentioned Patent Documents 1 to 6 describe trailer houses that move a box frame using rails, they have the following problems and are not yet sufficient.

[0011] Conventional trailer houses are prone to the accumulation of sand and dust on the rails, leading to increased wear on the rollers and rails, and making the rails susceptible to rust. Furthermore, the large number of rails and the need for high strength result in a complex structure, requiring greater durability for the rollers and rails, thus increasing costs. Additionally, the rail strength limitations restrict the expansion of the five-sided wall width of the box frame.

[0012] Conventional trailer houses require the five walls of the box frame to be moved simultaneously along rails, and performing the expansion work on the rails using only manual labor places a heavy burden on the workers.

[0013] Furthermore, in Patent Document 7, due to the waterproof structure, the horizontal members constituting the box frame are also used as waterproof rising sections (beams), and since materials are also needed to support the roof, that part protrudes downwards, creating a hanging wall where the main body and the extension section meet, thus detracting from the sense of unity. Moreover, in Patent Document 7, the wider the extension width, the larger the horizontal members constituting the box frame and waterproof rising sections (beams) become. The structure prevents wind and rain from blowing in with protruding members and box-shaped grooves of the roof members, and since the tip is constructed in a box shape, it requires precise and complex construction, which increases costs, and since this waterproof structure requires height, the roof height becomes low. As a result, the opening height becomes low, and it is difficult to increase the volume when extended in the extended state.

[0014] The trailer house described in Patent Document 7 has few walls, so from a strength standpoint it needs to be made of steel. When unfolding the box-frame structure, two side wall members connected in half and one side wall member are unfolded in a sliding manner like a folding screen, which places a heavy burden on the worker. For this reason, there are limitations on expanding the volume when extended from the standpoint of workability.

[0015] Therefore, the present invention aims to prevent the accumulation of sand and dust on the rails, reduce wear between the rollers and rails, prevent rusting of the rails, achieve a simple structure and cost reduction, reduce the weight burden on workers, and enable expansion of the volume when extended. [Means for solving the problem]

[0016] To solve the above problems, the present invention does not employ a method of moving the entire five-sided box frame on rails, but rather divides the box frame into a roof panel, floor panel, left side panel, right side panel, and front panel, and provides a structure in which the roof panel, floor panel, left side panel, and right side panel can be opened and closed in a rotatable manner, while also providing a structure in which the front panel is suspended from rails and moved below the rails.

[0017] The first invention comprises a box-shaped main body having a rectangular opening in its longitudinal side wall, a frame attached to the opening and capable of changing between a retracted state and an extended state, and a rail member, wherein the frame is divided into a roof panel rotatably attached to the upper longitudinal side of the opening, a floor panel rotatably attached to the lower longitudinal side of the opening, two side panels rotatably attached to both sides in the height direction of the opening, and a front panel having a roller on its upper side that is movable along the rail member, and in the retracted state, the roof panel, floor panel, side panels and This expandable trailer house is characterized in that the front panel is erected sequentially from the outside to the inside of the main body in the width direction of the main body at the opening, the rail member is divided into a long rail and a short rail shorter in length than the long rail, the long rail is fixed to the back surface of the roof panel and the short rail is fixed inside the main body in the width direction, and when the structure changes between the stored state and the expanded state, the roof panel rotates and unfolds so that the long rail and the short rail become continuous, and the front panel is suspended from the rail member and moves.

[0018] This invention features a structure in which the rail members are not exposed to the outside air, thus preventing the accumulation of sand and dust on the rail members, reducing wear on the rollers and rail members, and preventing the rail members from rusting. Furthermore, by limiting the members that move along the rail members to only the front panel rather than the entire structure, this invention reduces the weight load on the rail members and allows for a reduction in the amount of rail members, resulting in a simpler structure, improved durability of the rollers and rail members, and cost reduction.

[0019] In the present invention, since each panel of the housing body can be divided and operated independently, when changing the housing body from the stored state to the expanded state, the weight load on the operator can be reduced. When the front panel moves, the weight load on the rail member can be reduced, the amount of the rail member can also be reduced, and the volume at the time of expansion can be increased. Also, the burden on the operator is reduced.

[0020] In the present invention, it is preferable that the short rail has a telescopic structure capable of inserting and removing the rail with respect to the long rail.

[0021] According to this configuration, when the present invention changes between the stored state and the expanded state, by adopting a telescopic structure capable of inserting and removing the rail with respect to the long rail from the short rail, the connection between the long rail and the short rail can be smoothed, and the movement of the front panel can be smoothed.

[0022] In the expanded state, it is preferable that the lateral width of the roof panel is set to be longer than the lateral width of the floor panel, and the lower end of the front panel abuts or fits into the tip of the floor panel.

[0023] According to this configuration, when the housing body of the present invention changes between the stored state and the expanded state, the temporary support member that supports the roof panel can be supported by the ground instead of the floor panel, so that the floor panel can be prevented from being damaged by the temporary support member, and the intrusion of rainwater from between the front panel and the floor panel can also be prevented.

[0024] In the stored state, it is preferable that the roof panel closes the opening and becomes the side wall of the main body.

[0025] With this configuration, the present invention allows each panel to be folded and stored upright within the main body when the structure is stored, and the roof panel can function as an outer cover for the opening. Since the roof panel, which is inherently waterproof, acts as an outer cover for the opening, it is advantageous in terms of waterproofing. In particular, with respect to the floor panel, it is preferable for jack installation to expose the floor frame for strength reinforcement on the back of the floor panel and support the floor frame with jacks, but since the structure does not expose the floor panel to the outside when stored, even if such an exposed floor frame is provided on the back of the floor panel, there is no concern about waterproofing the floor panel, and the aesthetic appearance of the house when stored is not compromised.

[0026] A waterproof section is provided between the roof panel and the upper edge of the opening, and the waterproof section comprises a first waterproof section having an overhang and a downward-sloping section provided along the upper edge of the opening, and a second waterproof section having an overhang and a rising section provided along the upper edge of the roof panel, wherein the first waterproof section is provided above and opposite to the second waterproof section.

[0027] According to this configuration, the present invention can prevent rainwater from entering, at least in the expanded state, facilitate waterproofing work, and eliminate the need for height in the waterproofing structure, thus allowing for a structure that does not reduce the roof height. This reduces the burden of waterproofing measures.

[0028] The second invention comprises a main body manufacturing step of manufacturing a box-shaped main body having a rectangular opening in the longitudinal side wall, and a main body installation step of attaching a frame that can change between a retracted state and an extended state to the opening, wherein the main body installation step comprises a roller installation step of attaching rollers to the upper edge of the front panel, a rail member preparation step of preparing rail members that are divided into a long rail and a short rail shorter than the long rail, a long rail fixing step of fixing the long rail to the back surface of the roof panel, and a short rail fixing step of fixing the short rail inside the main body in the width direction, wherein in the long rail fixing step and the short rail fixing step, the main body changes between the retracted state and the extended state. The method for manufacturing an expandable trailer house is characterized in that, when changing between expanded and unfolded states, the roof panel rotates and unfolds so that the long rail and the short rail become continuous and the rollers of the front panel can pass through, and the structure installation step further comprises a side panel installation step of attaching two side panels rotatably to both sides of the opening in the height direction, a floor panel installation step of attaching a floor panel rotatably to the lower side of the opening in the length direction, a roof panel installation step of attaching the roof panel rotatably to the upper side of the opening in the length direction, and a front panel installation step of placing the rollers of the front panel on the short rail.

[0029] The second invention achieves the same effects as the first invention.

[0030] The third invention is a method for constructing an expandable trailer house comprising: a box-shaped main body having a rectangular opening in its longitudinal side wall; a frame attached to the opening and capable of changing between a retracted state and an expanded state; and rail members, wherein the frame comprises: a roof panel rotatably attached to the upper longitudinal side of the opening; a floor panel rotatably attached to the lower longitudinal side of the opening; two side panels rotatably attached to both sides in the height direction of the opening, respectively; and a front panel having a roller on its upper edge that is movable along the rail members, wherein the rail members are divided into a long rail and a short rail shorter in length than the long rail, the long rail is fixed to the back surface of the roof panel, and the short rail is fixed within the main body in the width direction, and the roof panel, floor panel, side panel and front panel This is a construction method for an expandable trailer house, comprising: a storage step in which the Nell panels are erected sequentially from the outside to the inside of the main body in the width direction of the main body at the opening of the main body; a roof panel rotation step in which the roof panel is rotated and unfolded from the storage state; a support step in which the roof panel is supported by a temporary support member; a floor panel unfolding step in which the floor panel is rotated and unfolded; a continuation step in which the short rail and the long rail are connected; a side panel unfolding step in which the side panel is rotated and unfolded; and a front panel unfolding step in which, with the roof panel supported by a temporary support member and the short rail and long rail connected, the roller of the front panel is moved from the short rail to the end of the long rail, the temporary support member is removed, and the structure is configured into a box frame shape.

[0031] The third invention provides the same effects as the first and second inventions. [Brief explanation of the drawing]

[0032] [Figure 1] This is a front view of the stored state of the expandable trailer house according to an embodiment of the present invention. [Figure 2] This is a rear view of the same object. [Figure 3] This is a left side view of the same object. [Figure 4] This is a right side view of the same object. [Figure 5] The same plane diagram. [Figure 6] This is a cross-sectional view taken from VI-VI in Figure 1. [Figure 7] This is a cross-sectional view taken along line VII-VII in Figure 5. [Figure 8] This is a front view of the extended state of the expandable trailer house according to an embodiment of the present invention. [Figure 9] This is a rear view of the same object. [Figure 10] This is a left side view of the same object. [Figure 11] This is a right side view of the same object. [Figure 12] The same plane diagram. [Figure 13] This is a cross-sectional view from line XIII-XIII in Figure 8. [Figure 14] This is a reference diagram showing the addition of facilities such as a kitchen and bathtub to the same cross-sectional view. [Figure 15] This is a cross-sectional view taken along line XV-XV in Figure 12. [Figure 16] This is a left side view of the unfolded part 1. [Figure 17] This is a cross-sectional view taken along line XVII-XVII in Figure 16. [Figure 18] This is a plan view of the first stage of development. [Figure 19] This is a cross-sectional view from XIX-XIX in Figure 18. [Figure 20] This is a left side view of the second stage of the unfolding process. [Figure 21] This is a cross-sectional view of line XXI-XXI in Figure 20. [Figure 22] This is a plan view of the second stage of development. [Figure 23] This is a cross-sectional view of line XXIII-XXIII in Figure 22. [Figure 24] This is a left side view of the unfolded state 3. [Figure 25] This is a cross-sectional view taken from XXV-XXV in Figure 24. [Figure 26] This is a plan view of the third stage of development. [Figure 27] This is a cross-sectional view of section XXVII-XXVII in Figure 26. [Figure 28] This is a left side view of the 4th stage of the unfolding process. [Figure 29] This is a cross-sectional view taken from XXIX-XXIX in Figure 28. [Figure 30] This is a plan view of the fourth stage of development. [Figure 31] This is a cross-sectional view taken along line XXXXI-XXXI in Figure 30. [Figure 32] This is a left side view of the unfolded part 5. [Figure 33] This is a cross-sectional view taken along the line XXXIII-XXXIII in Figure 32. [Figure 34] This is a plan view of the 5th stage of development. [Figure 35] This is a cross-sectional view taken from XXXV-XXXV in Figure 34. [Figure 36] (a) is a close-up of section A in Figure 7 (floor panel, left side panel, and right side panel are omitted), (b) is a close-up of section A in Figure 19 (floor panel, left side panel, and right side panel are omitted), (c) is a close-up of section A in Figure 35 (a front panel in motion is added for reference), and (d) is a close-up of section A in Figure 15. [Figure 37] This is a view of the back of the floor panel. [Figure 38] This is a longitudinal cross-sectional view of the waterproof section and its surrounding components. [Figure 39] (a) Cross-sectional view including the back surface of the roof panel, (b) Cross-sectional view of the rail, (c) Cross-sectional view including the rail, roller, fasteners, and front panel, and (d) Cross-sectional view of the rail, roller, fasteners, and front panel from another direction. [Modes for carrying out the invention]

[0033] The expandable trailer house 1 (hereinafter referred to as "house") of the embodiment of the present invention, as shown in Figures 1 to 39, comprises a box-shaped main body 2 having a ceiling 21, a left side wall 22 in the length direction L, a right side wall 23, a front wall 24 in the width direction W, a rear wall 25 in the width direction W with a door 25a, and a floor 26, and an opening 29 with a rectangular opening in the side wall 22 (see Figures 13, 19, etc.), and a frame 3 attached to the opening 29 that can change between a stored state and an expanded state. At the rear of the opening 29, a wall 22a extends inward in the width direction W (see Figure 6, etc.).

[0034] As shown in Figures 6 and 7, the structure 3 is divided into a roof panel 31 rotatably attached to the upper edge of the opening 29 in the longitudinal direction L, a floor panel 32 having a floor frame 32a (see Figure 37) rotatably attached to the lower edge of the opening 29 in the longitudinal direction L, a left side panel 33 rotatably attached to the left edge of the opening 29 in the height direction H, a right side panel 34 rotatably attached to the right edge of the opening 29 in the height direction H, and a front panel 35 having a window 35c provided by fixing a roller 35b to its upper edge 35a with a fastener 35d (see Figures 39(c) and (d)). As shown in Figure 37, one end of the floor panel 32 is rotatably attached to the vertical surface of the notch 26a of the floor 26 by a hinge.

[0035] Here, the names of the left wall 22, right wall 23, front wall 24, and rear wall 25 of the main body 2 are not based on their arrangement when the house 1 is installed, but rather on the direction of travel when the house 1 is being towed. The front is defined as the direction in front of travel, the rear as the direction in front of travel, the right as the right side when viewing the house 1 from the direction of travel (see Figure 4), and the left as the left side.

[0036] A fixed wall 22a extends horizontally in the width direction W from an opening 29 in the left wall 22, and has a free end. The left side panel 33 is attached to this fixed wall 22a with hinges. The right side panel 34 is attached to the inner wall side of the front wall 24 with hinges.

[0037] The upper surfaces of the left side panel 33 and the right side panel 34 are sloped to match the slope of the roof panel 31.

[0038] House 1 further has rail members 4 which are divided into long rails 41 and short rails 42 which are shorter than the long rails 41, as shown in Figures 36 and 39(a). Two rail members 4 and two rollers 35b are exemplified, but the number is not limited and can be used as appropriate. The load-bearing capacity of the rollers is exemplified to be 300 to 600 kg. The rail members 4 are provided to extend in the width direction W when extended. The long rail 41 is fixed to the back surface of the roof panel 31 so as to extend in the width direction when extended, and the short rail 42 is made axially expandable and expandable and fixed to a fixing member 5 provided on the main body 2 so as to extend in the width direction W, so that when the roof panel 31 rotates and unfolds, the long rail 41 and the short rail 42 are continuous in a coaxial manner. When the main body 3 changes between a retracted state and an extended state, the roller 35b moves between the long rail 41 and the short rail 42, so that the front panel 35 is suspended from the coaxial rail member 4 and moves. In this embodiment, the short rail 42 is retractable, and when the main body 3 changes between a retracted state and an extended state, the long rail 41 and the short rail 42 are configured to be coaxially continuous. However, as long as the continuity between the long rail 41 and the short rail 42 is maintained so that the roller 35b of the front panel 35 can pass through when the main body 3 changes between a retracted state and an extended state, the short rail 42 does not have to be retractable, and the long rail and the short rail do not have to be coaxial.

[0039] In House 1, since the rail members 4 are not exposed to the outside air, sand and dust are less likely to accumulate on the rail members 4, resulting in less wear on the rollers 35b and rail members 4, and making the rail members 4 less prone to rusting. In addition, in House 1, each panel 31 to 35 of the frame 3 is divided, and only the front panel 35 moves along the rail 4 instead of the entire frame 3, thereby reducing the weight of the moving members and reducing the weight load on the rail members 4. This allows for a reduction in the amount of rail members 4, resulting in a simpler structure, while also improving the durability of the rollers 35b and rail members 4, and achieving cost reduction.

[0040] In House 1, each panel 31-35 of the frame 3 is divided and can operate independently, thus reducing the weight burden on workers when changing the frame 3 between the stored and expanded states. By making only the front panel 35 the component that moves along the rail member 4, the weight of the component to be moved is reduced, thereby reducing the weight load on the rail member 4, reducing the amount of rail member 4 required, and increasing the width of the expanded volume. Furthermore, since the roof panel 31 is divided, the height of the opening 29 can be secured.

[0041] When viewed from the underside, the floor panel 32 has an exposed floor frame 32a (see Figure 37) that maintains its strength. Considering strength, the floor frame 32a is usually in a grid shape, but it can also be assembled in a river-like pattern flowing in one direction instead of a grid.

[0042] Here, the names of the left side panel 33, the right side panel 34, and the front panel 35 of the structural frame 3 are based on the front view when the greenhouse is in an expanded state, as shown in Figure 8. The panel located at the front is named the front panel 35, the panel located to the left in the front view is named the left side panel 33, and the panel located to the right in the front view is named the right side panel 34.

[0043] When the jack 12 supports the floor panel 32, after placing the jack 12 on the ground, a jack support member 12a, which is a square timber, is placed on top of the jack 12, the jack support member 12a is made horizontal, and then the jack support member 12a supports the floor frame 32a, thereby ensuring the horizontality and strength of the floor panel. In this way, having the floor frame 32a exposed on the back of the floor panel 32 improves the strength of the floor and the ease of jack installation. However, if the structure is such that the floor panel 32 is positioned on the outermost side when stored, it becomes necessary to apply a waterproofing material to cover the floor frame 32a from the standpoint of waterproofing the floor panel 32, and the floor frame 32a cannot be exposed, making it difficult to position and install the jack.

[0044] In this embodiment, the roof panel 31 (the outside of the roof panel 31 is originally waterproof) can function as an outer cover for the opening 29. Therefore, in the stored state, the floor framing 32a is not exposed to the outside, and the floor framing 32a can be provided exposed on the back surface of the floor panel 32 without worrying about waterproofing, and the aesthetic appearance of the house 1 in the stored state is not impaired.

[0045] The long rail 41 is fixed to the back surface of the roof panel 31 (see Figures 36 and 39(a)), and the short rail 42 has an extendable structure that allows it to be extended and retracted relative to the long rail 41. The outer end of the long rail 41 is a restricting or closing section to prevent the front panel 35 from falling off. The inner end of the short rail 42 is a restricting or closing section to prevent the front panel 35 from falling off.

[0046] With this configuration, when House 1 changes between the retracted and extended states, the short rail 42 can be extended and retracted relative to the long rail 41, thereby facilitating the movement of the front panel 35. In the state shown in Figure 15, where the movement and installation of the front panel 35 are complete and the connection of the rail members 4 is disconnected, the long rail 41 is inclined. However, in the state shown in Figure 35, where the rail members 4 are continuous in order to move the front panel 35, the rail members 4 are not inclined. The reason the long rail 41 is inclined in Figure 15 is because the roof panel 31 is inclined for waterproofing purposes.

[0047] In the expanded state of the structure 3, the width of the roof panel 31 is set to be longer than that of the floor panel 32, and the lower end of the front panel 35 abuts against the front end of the floor panel 32, although they may be fitted together if necessary. Alternatively, the floor panel 32 may be covered by an extension member (not shown) extending downward from the front panel 35 to provide a waterproof structure.

[0048] With this configuration, when the structure 3 of House 1 changes between the retracted and extended states, the temporary support members 7 (see Figures 16, 19, etc., illustrations may be omitted as appropriate) that support the roof panel 31 can be supported on the ground instead of the floor panel 32. This prevents the temporary support members 7 from damaging the floor panel 32 and also prevents rainwater from entering between the front panel 35 and the floor panel 32.

[0049] In the stowed state, the roof panel 31 closes the opening 29 and becomes a side wall of the main body 2.

[0050] With this configuration, when the structure 3 is stored, each panel 31 to 35 of the house 1 can be folded and stored upright within the main body 2, and the roof panel 31 can function as an outer cover for the opening 29. As mentioned above, even if the floor frame 32a is exposed on the back surface of the floor panel 32, there are no waterproofing problems for the floor panel 32 when stored, and the aesthetic appearance of the house 1 when stored is not compromised.

[0051] As shown in Figure 38, a waterproof section 6 is provided between the roof panel 31 and the upper edge of the opening 29. The waterproof section 6 comprises a first waterproof section 61 having an overhanging portion 61a and a downward-sloping portion 61b provided on the left side wall 22 above the upper edge of the opening 29, a second waterproof section 62 having an overhanging portion 62a and a upward-sloping portion 62b provided along the upper edge of the roof panel 31, a waterproof space 65 defined by the first waterproof section 61 and the second waterproof section 62, and a waterproof packing 66 provided at the lower end of the first waterproof section 61. The waterproof packing 66 is made of soft rubber and, once compressed, returns to its original shape due to elastic force when the roof panel 31 is stored. The first waterproof section 61 is installed on the upper side opposite the second waterproof section 62. In addition to the waterproofing effect provided by the waterproof space 65 defined by the first waterproof section 61 and the second waterproof section 62, the waterproof packing 66 seals the gap between the first waterproof section 61 and the second waterproof section 62, thereby enhancing watertightness.

[0052] With this configuration, House 1 can prevent rainwater from entering, at least in its expanded state, and waterproofing can be easily implemented. It is also possible to maintain a roof height. This reduces the burden of waterproofing measures.

[0053] House 1 also includes a chassis 10 having wheels 8, a towing section 9, a frame 14a in the longitudinal direction L, a frame 14b in the lateral direction W, and an anti-entanglement member 13, a stake 11 for fixing the towing section 9 to the ground, a jack auxiliary member 12a, and a jack 12. The floor 26 of the main body 2 is fixed on the chassis 10 by fastening members.

[0054] In this embodiment, the house 1 has a structure in which the rail member 4 is not exposed to the outside air, so sand and dust are less likely to accumulate on the rail member 4, wear on the roller 35b and rail member 4 is reduced, and the rail member 4 is less likely to rust. Furthermore, by making the front panel 35 move along the rail member 4, the weight load on the rail member 4 is reduced, and the amount of rail member 4 can be reduced, resulting in a simpler structure, improved durability of the roller 35b and rail member 4, and cost reduction.

[0055] In House 1, each panel 31-35 of the frame 3 is divided and can operate independently, thus reducing the weight load on workers when changing the frame 3 between the stored and expanded states. When moving the front panel 35, the weight load on the rail members 4 can be reduced, the amount of rail members 4 can be reduced, and the volume when expanded can be increased. In addition, the burden on workers is reduced.

[0056] In this embodiment, the floor panel 32 is provided with a floor frame 32a exposed on its underside to maintain strength. When the jack 12 supports the floor panel 32, after placing the jack 12 on the ground, a jack support member 12a, which is a square timber, is placed on top of the jack 12, the jack support member 12a is made horizontal, and then the floor frame 32a is supported by the jack support member 12a, thereby ensuring the horizontal position and strength of the floor panel.

[0057] In this case, because the floor frame 32a is exposed on the back surface of the floor panel 32, the position of the floor frame 32a can be seen when the floor panel 32 is unfolded, making it easy to align the jack 12 with the floor frame 32a and improving the workability of the jack. However, if the floor panel 32 is positioned on the outermost side when stored, from the standpoint of waterproofing the floor panel 32, it is necessary to cover the floor frame 32a with a waterproof finishing material (such as exterior wall material) or cover it with a sheet during transport and storage. If it is covered with a finishing material, the floor frame 32a cannot be exposed, making it difficult to position and install the jack.

[0058] Furthermore, because the finishing material comes into contact with the jack, there is a risk of cracking, denting, or damage to the finishing material, and it becomes more susceptible to the effects of weather such as wind and rain. If the floor members are covered with a sheet or the like, a large sheet large enough to cover the trailer house is required, which increases the burden of the work of covering with the sheet or the like, and also increases costs. In this embodiment, the roof panel 31 (the outside of the roof panel 31 is originally waterproof) can function as an outer cover for the opening 29, so the floor panel 32 is not exposed to the outside when stored, and the above-mentioned inconveniences do not occur.

[0059] In this embodiment, the jack support member 12a and its leveling are performed to make the jack installation more efficient. However, the jack support member 12a and its leveling can be omitted as appropriate. If omitted, the configuration in which the roof panel 31 is located on the outermost side in the stored state becomes even more important in order to position the jack 12 and the floor frame 32a and to prevent damage to the waterproofing finish material by the jack 12.

[0060] A method for manufacturing an expandable trailer house is described. This manufacturing method comprises a main body manufacturing step, in which a box-shaped main body 2 having a rectangular opening 29 in the longitudinal side wall 22 is manufactured, fixing members 5 are provided to be fixed to the main body 2, and a fixing wall 22a is provided on the left side in the height direction of the opening 29; and a frame installation step, in which a frame 3 that can change between a stored state and an expanded state is attached to the main body 2. The frame installation step includes the following steps. Note that the steps do not necessarily have to be performed in the order they are described.

[0061] A roller mounting step is performed in which the roller 35b is attached to the upper edge 35a of the front panel 35.

[0062] A rail member preparation step is performed to prepare a rail member 4 which is divided into a long rail 41 and a short rail 42 which is shorter than the long rail 41 and can be extended and retracted in the axial direction.

[0063] A long rail fixing step is performed to fix the long rail 41 to the back surface of the roof panel 31.

[0064] A short rail fixing step is performed to fix the short rail 42 to the fixing member 5 inside the main body 2 in the width direction.

[0065] In the long rail fixing step and the short rail fixing step, when the structure 3 transitions between the stowed state and the extended state, the long rail 41 and the short rail 42 are fixed in a continuous manner, allowing the roller 35b of the front panel 35 to pass over the long rail 41 and the short rail 42. In this embodiment, the configuration is such that the retractable short rail is extended in order to connect the short rail 42 and the long rail 41, but it is not necessary to make the short rail 42 retractable if a continuous structure is obtained that allows the roller 35b of the front panel 35 to pass over it.

[0066] A side panel installation step is performed in which the left side panel 33 is rotatably attached with hinges to a fixed wall 22a located on the left side in the height direction of the opening 29, and the right side panel 33 is attached with hinges to the inner wall side of the front wall 24 located on the right side in the height direction of the opening 29.

[0067] A floor panel installation step is performed in which a floor panel 32 is attached with hinges to the lower edge of the opening 29 in the longitudinal direction L so as to be rotatable.

[0068] A roof panel installation step is performed in which the roof panel 31 is attached to the upper edge of the opening 29 in the longitudinal direction with hinges so as to be rotatable.

[0069] The front panel installation step is performed, which involves placing the rollers 35b of the front panel 35 onto the short rails 42.

[0070] This method of manufacturing the expandable trailer house produces the same effect as House 1.

[0071] The construction method for the expandable trailer house of the present invention will be described. This method consists of the following steps. Note that the steps do not necessarily have to be performed in the order they are described.

[0072] The structure 3, which consists of a roof panel 31, a floor panel 32, a left side panel 33, a right side panel 34, and a front panel 35, and which can change between a stored state and an extended state, undergoes a storage step in which the roof panel 31, floor panel 32, left side panel 33, right side panel 34, and front panel 35 are erected in order from the outside to the inside of the main body 2 in the width direction W of the main body 2 at the opening 29.

[0073] From the aforementioned stored state, a roof panel rotation step is performed to rotate and unfold the roof panel 31. (See Figures 16 to 19.)

[0074] A support step is performed in which the roof panel 31 is horizontally supported by the temporary support member 7. (Figure 1) (See Figures 16-19.)

[0075] After the jack 12 and jack support member 12a are placed on the ground, the floor panel deployment step is performed, in which the floor panel 32 is rotated and unfolded. (See Figures 20 to 23.)

[0076] A continuous step is performed in which the retractable short rail 42 is extended to connect the short rail 42 and the long rail 41 coaxially. (See Figure 23.) In this embodiment, the retractable short rail is extended to connect the short rail 42 and the long rail 41 coaxially in order to connect the short rail 42 and the long rail 41. However, as long as continuity is obtained that allows the roller 35b of the front panel 35 to pass through, it is not necessary for the short rail 42 to be retractable or for both rails to be coaxial. Also, in this embodiment, in the state shown in Figures 19 to 23, both the short rail 42 and the long rail 41 are horizontal and coaxial, but it is sufficient if the long rail 41 is slightly inclined as long as they are continuous, and it is not necessarily required that both rails be coaxial.

[0077] The roof panel 31 is supported horizontally to the ground by the temporary support member 7, and with the short rail 42 and long rail 41 in a continuous state, the left side panel 33 and the right side panel 34 are rotated and unfolded in a side panel unfolding step (Figures 24 to 31).

[0078] The roller 35b of the front panel 35 is moved from the short rail 42 to the end 41a of the long rail 41, the short rail 42 is retracted to break the connection between the short rail 42 and the long rail 41, the temporary support member 7 is removed, and the front panel 35 is abutted against or fitted into the floor panel 32 from above in the front panel deployment step. (See Figures 32-35 and 15.) In this embodiment, the connection between the short rail 42 and the long rail 41 is broken before removing the temporary support member 7, but depending on the configuration of the rail members, they may remain connected.

[0079] The construction method for the expandable trailer house of the present invention provides the same effects as the manufacturing method for House 1 and the expandable trailer house.

[0080] Although this embodiment has been described above, it goes without saying that various forms of the present invention can be implemented by appropriately modifying, adding to, etc., without departing from the spirit of the present invention. For example, the main body 2, opening 29, frame 3, roof panel 31, floor panel 32, left side panel 33, right side panel 34, front panel 35, rail member 4, fixing member 5, waterproof part 6, etc. in this embodiment are not limited to the shapes and structures shown, but can be appropriately shaped, structured, or combinations thereof. The front panel 35 may also be provided with an extension member (not shown) at its tip to create a waterproof structure. [Industrial applicability]

[0081] Expandable trailer homes have great industrial potential because they can be put into practical use by overcoming manufacturing difficulties. [Explanation of symbols]

[0082] 1. Expandable trailer house (house) 2 Main unit 21 Ceiling 22 Left side wall 23 Right side wall 24 Front wall 25 Back wall 26 beds 29 Opening 3 skeleton 31 Roof Panels 32 floor panels 33 Left side panel 34 Right side panel 35 Front Panel 35a Top edge 35b Laura 35c window 4 Rail members 41 Long rail 42 Short rails 5 Fixing members 6 Waterproof part 7 Temporary support member 8 wheels 9 Traction part 10 Chassis 11 stake

Claims

1. A box-shaped body having a rectangular opening in the side wall along its length, A body attached to the aforementioned opening, which can change between a retracted state and an extended state, A rail member is provided, The aforementioned structure, A roof panel is rotatably attached to the upper edge in the longitudinal direction of the opening, A floor panel is rotatably attached to the lower edge in the longitudinal direction of the opening, Two side panels are rotatably attached to both sides of the opening in the height direction, A front panel having a roller on its upper edge that is movable along the rail member, It is divided into In the aforementioned storage state, the roof panel, floor panel, side panel, and front panel are erected in the opening in the width direction of the main body, sequentially from the outside to the inside of the main body. The rail member is divided into a long rail and a short rail that is shorter in length than the long rail. The aforementioned long rail is fixed to the back surface of the roof panel, The short rail is fixed inside the main body in the width direction, When the frame changes between the retracted state and the extended state, the roof panel rotates and unfolds so that the long rail and the short rail become continuous, and the front panel is suspended from the rail members and moves. An expandable trailer house featuring [specific features].

2. The expandable trailer house according to claim 1, wherein the short rail has an extendable structure that allows the rail to be extended and retracted relative to the long rail.

3. In the extended state, the width of the roof panel is set to be longer than the width of the floor panel, and the lower end of the front panel abuts against or fits into the front end of the floor panel, according to claim 1.

4. The expandable trailer house according to claim 1, wherein in the stored state, the roof panel closes the opening and becomes a side wall of the main body.

5. The expandable trailer house according to claim 1, wherein a waterproof section is provided between the roof panel and the upper edge of the opening, the waterproof section comprising a first waterproof section having an overhang and a downward-sloping section provided along the upper edge of the opening, and a second waterproof section having an overhang and a rising section provided along the upper edge of the roof panel, the first waterproof section being provided above and opposite to the second waterproof section.

6. A body manufacturing step involves manufacturing a box-shaped body having a rectangular opening in the side wall in the longitudinal direction, The system includes a frame installation step for attaching a frame that can be changed between a retracted state and an extended state to the aforementioned opening, The frame installation step is, A roller mounting step for attaching rollers to the top edge of the front panel, A rail member preparation step involves preparing rail members that are divided into a long rail and a short rail that is shorter than the long rail, A long rail fixing step for fixing the aforementioned long rail to the back surface of the roof panel, The system includes a short rail fixing step for fixing the short rail in the width direction within the main body, In the aforementioned long rail fixing step and short rail fixing step, when the frame changes between the retracted state and the extended state, the roof panel rotates and unfolds so that the long rail and the short rail become continuous and are fixed so that the rollers of the front panel can pass through. The frame installation step further includes, A side panel installation step involves attaching two side panels to each side of the opening in the height direction so that they can rotate, A floor panel installation step includes rotatably attaching a floor panel to the lower edge in the longitudinal direction of the opening, A roof panel installation step includes rotatably attaching the roof panel to the upper edge in the longitudinal direction of the opening, A front panel installation step involves installing the rollers of the front panel on the short rail, A method for manufacturing an expandable trailer house, characterized by comprising the following:

7. A box-shaped body having a rectangular opening in the side wall along its length, A body attached to the aforementioned opening, which can change between a retracted state and an extended state, A rail member is provided, The aforementioned structure, A roof panel is rotatably attached to the upper edge in the longitudinal direction of the opening, A floor panel is rotatably attached to the lower edge in the longitudinal direction of the opening, Two side panels are rotatably attached to both sides of the opening in the height direction, A front panel having a roller on its upper edge that is movable along the rail member, Equipped with, A method for constructing an expandable trailer house, wherein the rail member is divided into a long rail and a short rail shorter in length than the long rail, the long rail is fixed to the back surface of the roof panel, and the short rail is fixed within the main body in the width direction, A storage step in which the roof panel, floor panel, side panel, and front panel are in a stored state in which they are erected in the width direction of the main body, in order from the outside to the inside of the main body at the opening of the main body, From the aforementioned stored state, a roof panel rotation step is performed to rotate and unfold the roof panel, A support step for supporting the aforementioned roof panel with a temporary support member, A floor panel deployment step in which the floor panel is rotated and unfolded, A continuous step that connects the short rail and the long rail, A side panel deployment step in which the side panel is rotated and unfolded, The roof panel is supported by a temporary support member, and with the short rail and long rail in a continuous state, the roller of the front panel is moved from the short rail to the end of the long rail, the temporary support member is removed, and the frame is configured into a box frame shape, comprising a front panel deployment step. Construction method for expandable trailer homes.

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